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PostPosted: Feb 18th, '18, 16:14 
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I was wondering if anyone knows how to capture the return flow from the GB's into the sump and turn it into enough electricity to run some LED strip lighting?

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PostPosted: Feb 18th, '18, 16:29 
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most likely a small inflow turbine but I don't think you can get these on a hobby scale.

two likely cheap options would be a hobby-kit dynamo or a bicycle dynamo.
I doubt you could get these as in-line impellers.
Maybe a waterwheel at the end of the flow back into the tank (over the top style).
else go to a large diameter pipe to get half depth flow and make some form of plastic paddle.

Having said that the chinese are making some shower and tap dynamo lights...
alibaba com => Water Dynamo Energy Powered 9 LED Light 7 Color Changing Shower Head
also on eBay

but I suspect a homemade waterwheel project might be OK for what you want ?
I have seen hobby tech sites showing how to wire up a dynamo from scratch (magnets and copper wire coil).

depends how ambitious you are for your lights and what flow you have.

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PostPosted: Feb 18th, '18, 17:34 
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Excellent great ideas thanks Dif.

I've got about 10000lpm max from this pump - probably more like 7000 after head height.

The stream coming out of a 90mm pipe will be pouring out - directed into a home made water wheel of some sort.

The bit I'm not sure about is the dynamo which I'm reading up on now.

I could just put this in the line of the pump but that's not the point.
http://small-generator.com/buy/index.ph ... 02o44cb993

Point being I wanted a water wheel for aesthetic purposes and why not use the motion for something else :)

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PostPosted: Feb 18th, '18, 18:27 
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the waterwheel would be good.
Go for a top pour and you will get a pretty good outcome - that will be pretty efficient.

I recall seeing a top feed waterwheel at the old tourist mine and village out your way once when driving around Gippsland somewhere east of Melbourne / Phillip Island from memory.

Quite a few internet sites talk about making your own dynamo - geek tech / science fair projects / youtube etc.
else modifying some of the bike ones will probably work as well.
An old electric motor or even electrical tools would provide a good coil - might get one from a tip, workshop etc.


"small inflow turbine " - meant small inline turbine ;-)
yep - the sort of thing on that site.
There is another version that is like an impeller that goes into larger diameter pipe like a joiner.
But always blockage risk.


[edit] also try some of the self sustaining web sites. I had a book once that talked about a water wheel and/or wind turbine dynamo - worked for either and produced around 12v.

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PostPosted: Feb 18th, '18, 20:00 
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You might be surprised at how little energy you produce, but if it's only a couple of extremely low powered LEDs, it might work.

head height X litres per second (flow rate) X 9.81 X waterwheel efficiency (lucky if you get 25% from a waterwheel) X electrical efficiency - with such a small device, I'd suggest 30%, IF you can find a suitable 2W generator!

I don't know how much head you have, but lets say 1 metre

1 X (7000/3600) X 9.81 X 0.25 X 0.33 = <2W if you do everything right.


The cost of setting it up will be more than a small solar panel, which will produce significantly more energy per day.
Good luck with it!

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PostPosted: Mar 29th, '18, 21:47 
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Seriously, this cant be healthy.
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This is a great forum for all things magnetic and electrical...

https://www.fieldlines.com/

It's been a while since I've been there (researching wind turbines) but a few years back there were some awesome minds, with awesome enthusiasm on that forum.

I'm sure they will still be there.

You can also find a water wheel power production calculator half way down this page...

http://www.waterwheelplace.com/water_wh ... icity.html

Personally I think it would be more productive and fun to make a flour mill, or something mechanical to run with the flow.

A bird scarer comes to mind. Picture a string with a weight on it hanging from a tall, rotating (water powered) pole above a veggie patch. No more birds ever :)

But I like birds, so I just plant extra for them. Funny thing is, there always seems to be more birds next year.

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PostPosted: May 31st, '18, 16:48 
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Hi Jayendra,
Are you pumping 7000lpm or 7000lper hour?
If you use E=mgh x expected efficiency, you would get the available energy as Gunnagilla pointed out,
so if lam, then E = 7000/60kg/sec x 9.8 x height X 0.3 (answer in watts).
if mph, then above with 7000/3600 in first part of equation.
Look at an overshot pelton wheel (the Rainbow company in Nimbin used to make them, may still do?)


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PostPosted: May 31st, '18, 17:34 
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Bl6%%dy autocorrect!
Not lam but, lpm and not mph, but lph


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PostPosted: Jun 3rd, '18, 08:02 
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If you apply any more back pressure to a pump like an inline generator the amps required to run the pump will increase plus losses due to the inefficiencies caused by the generator. So the lights would use less power if they were plugged directly into the power source. Considerable height syphoned and free falling water could and would negate those issues and create a whole other set of issues.

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